package com.metaverse.backend.utils;

import com.metaverse.backend.annotations.Searchable;
import com.metaverse.backend.dto.PageQuery;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;

import javax.persistence.criteria.*;
import java.lang.reflect.Field;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.regex.Pattern;

@Slf4j
@SuppressWarnings("ALL")
public class JpaUtils {
    public static PageRequest toPageRequest(PageQuery pageQuery) {
        PageRequest pageRequest;
        if (StringUtils.isNotEmpty(pageQuery.getSort())) {
            List<Sort.Order> orders = new ArrayList<>();
            for (String sortStr : pageQuery.getSort().split(";")) {
                String direction = "asc";
                String prop = sortStr;
                if (sortStr.contains(",asc") || sortStr.contains(",desc")) {
                    prop = sortStr.split(",")[0];
                    direction = sortStr.split(",")[1];
                }
                orders.add("asc".equals(direction) ? Sort.Order.asc(prop) : Sort.Order.desc(prop));
            }
            pageRequest = PageRequest.of(pageQuery.getPage(), pageQuery.getSize(), Sort.by(orders));
        } else {
            pageRequest = PageRequest.of(pageQuery.getPage(), pageQuery.getSize());
        }
        return pageRequest;
    }

    public static <T> Specification<T> toSpecification(PageQuery pageQuery, Class<?> queryClass) {
        return (Specification<T>) (root, criteriaQuery, criteriaBuilder) -> {
            List<Predicate> and = toPredicates(pageQuery, queryClass, root, criteriaQuery, criteriaBuilder);
            return criteriaBuilder.and(and.toArray(new Predicate[0]));
        };
    }

    public static <T> List<Predicate> toPredicates(PageQuery pageQuery, Class<?> queryClass, Root<T> root,
                                                   CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
        List<Predicate> and = new ArrayList<>();
        pageQuery.getQuery().forEach((property, value) -> {
            if (value == null) {
                return;
            }
            if (String.class.equals(value.getClass())) {
                if (StringUtils.isEmpty((String) value)) {
                    return;
                }
            }
            Field field = getDeclaredField(queryClass, property);
            if (field == null) return;

            Class fieldType = field.getType();
            if (Enum.class.isAssignableFrom(fieldType)) {
                if (value instanceof Collection) {
                    if (!((Collection) value).isEmpty()) {
                        List list = new ArrayList();
                        for (Object o : ((Collection) value)) {
                            list.add(Enum.valueOf(fieldType, String.valueOf(o)));
                        }
                        and.add(root.get(property).in(list));
                    }
                } else if (value instanceof String && StringUtils.isNotEmpty((String) value)) {
                    if (((String) value).contains(",")) {
                        String[] arr = ((String) value).split(",");
                        List list = new ArrayList();
                        for (String s : arr) {
                            list.add(Enum.valueOf(fieldType, s));
                        }
                        and.add(root.get(property).in(list));
                    } else {
                        and.add(criteriaBuilder.and(criteriaBuilder
                                .equal(root.get(property), Enum.valueOf(fieldType, String.valueOf(value)))));
                    }
                }
            } else if (LocalDateTime.class == fieldType) {
                if (value instanceof List) {
                    List list = (List) value;
                    //如果传空则为判断库时间小于当前时间
                    if (list.isEmpty()) {
                        and.add(criteriaBuilder.lessThanOrEqualTo(root.get(property), LocalDateTime.now()));
                    }
                    if (list.size() == 1) {
                        //为1表示库时间大于当前时间
                        LocalDateTime start = DateTimeUtils
                                .toLocalDateTime((String) list.get(0), "yyyy-MM-dd HH:mm:ss");
                        and.add(criteriaBuilder.greaterThanOrEqualTo(root.get(property), start));
                    } else if (list.size() == 2) {
                        LocalDateTime start = DateTimeUtils
                                .toLocalDateTime((String) list.get(0), "yyyy-MM-dd HH:mm:ss");
                        LocalDateTime end = DateTimeUtils
                                .toLocalDateTime((String) list.get(1), "yyyy-MM-dd HH:mm:ss");
                        and.add(criteriaBuilder.between(root.get(property), start, end));
                    }
                } else if (value instanceof String && Pattern
                        .matches("^\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2},\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}$", (String) value)) {
                    String[] arr = ((String) value).split(",");
                    LocalDateTime start = DateTimeUtils.toLocalDateTime(arr[0], "yyyy-MM-dd HH:mm:ss");
                    and.add(criteriaBuilder.greaterThanOrEqualTo(root.get(property), start));
                    LocalDateTime end = DateTimeUtils.toLocalDateTime(arr[1], "yyyy-MM-dd HH:mm:ss");
                    and.add(criteriaBuilder.lessThanOrEqualTo(root.get(property), end));
                } else {
                    and.add(criteriaBuilder.and(criteriaBuilder.equal(root.get(property), DateTimeUtils
                            .toLocalDateTime((String) value, "yyyy-MM-dd HH:mm:ss"))));
                }
            } else if (LocalDate.class == fieldType) {
                if (value instanceof List) {
                    List list = (List) value;
                    //如果传空则为判断活动开始时间小于当前时间
                    if (list.isEmpty()){
                        and.add(criteriaBuilder.lessThanOrEqualTo(root.get(property), LocalDate.now()));
                    }
                    if (list.size() == 1) {
                        LocalDate start = DateTimeUtils
                                .toLocalDate((String) list.get(0), "yyyy-MM-dd");
                        and.add(criteriaBuilder.greaterThanOrEqualTo(root.get(property), start));
                    } else if (list.size() == 2) {
                        LocalDate end = DateTimeUtils
                                .toLocalDate((String) list.get(1), "yyyy-MM-dd");
                        and.add(criteriaBuilder.lessThanOrEqualTo(root.get(property), end));
                    }
                } else if (value instanceof String && Pattern
                        .matches("^\\d{4}-\\d{2}-\\d{2},\\d{4}-\\d{2}-\\d{2}$", (String) value)) {
                    String[] arr = ((String) value).split(",");
                    LocalDate start = DateTimeUtils.toLocalDate(arr[0], "yyyy-MM-dd");
                    and.add(criteriaBuilder.greaterThanOrEqualTo(root.get(property), start));
                    LocalDate end = DateTimeUtils.toLocalDate(arr[1], "yyyy-MM-dd");
                    and.add(criteriaBuilder.lessThanOrEqualTo(root.get(property), end));
                } else {
                    and.add(criteriaBuilder.and(criteriaBuilder.equal(root.get(property), DateTimeUtils
                            .toLocalDateTime((String) value, "yyyy-MM-dd"))));
                }
            } else {
                Path propPath = root.get(property);
                //针对字符串都提供模糊搜索功能
                if(propPath.getJavaType().isAssignableFrom(String.class)){
                    Expression<String> likeExp =  criteriaBuilder.function("concat", String.class,
                            criteriaBuilder.literal("%"), criteriaBuilder.literal(value), criteriaBuilder.literal("%"));
                    and.add(criteriaBuilder.and(criteriaBuilder.like(root.get(property), likeExp)));
                }else{
                    and.add(criteriaBuilder.and(criteriaBuilder.equal(propPath, value)));
                }


            }
        });
        if (StringUtils.isNotEmpty(pageQuery.getSearch())) {
            Field[] fields = queryClass.getDeclaredFields();
            List<Predicate> or = new ArrayList<>();
            try {
                if (StringUtils.isNumeric(pageQuery.getSearch())) {
                    or.add(criteriaBuilder.equal(root.get("id"), Long.parseLong(pageQuery.getSearch())));
                }
            } catch (Exception ignored) {
            }
            for (Field field : fields) {
                Searchable annotation = field.getAnnotation(Searchable.class);
                if (annotation == null) {
                    continue;
                }
                if (!annotation.value()) {
                    continue;
                }

                if (field.getType() == String.class) {
                    or.add(criteriaBuilder.like(root.get(field.getName()), "%" + pageQuery.getSearch() + "%"));
                } else if (field.getType() == Long.class || field.getType() == long.class) {
                    try {
                        or.add(criteriaBuilder.equal(root.get(field.getName()), Long.parseLong(pageQuery.getSearch())));
                    } catch (Exception ignore) {
                    }
                } else if (field.getType() == Integer.class || field.getType() == int.class) {
                    try {
                        or.add(criteriaBuilder
                                .equal(root.get(field.getName()), Integer.parseInt(pageQuery.getSearch())));
                    } catch (Exception ignore) {
                    }
                }

            }
            and.add(criteriaBuilder.or(or.toArray(new Predicate[0])));
        }
        return and;
    }

    private static Field getDeclaredField(Class<?> clazz, String property) {
        String className = clazz.getName();
        while (clazz != null && clazz != Object.class) {
            try {
                return clazz.getDeclaredField(property);
            } catch (NoSuchFieldException ignored) {
            }
            clazz = clazz.getSuperclass();
        }
        log.debug("no such field [{}] in class [{}]", property, className);
        return null;
    }
}
